diff options
author | Lucas De Marchi <lucas.demarchi@intel.com> | 2019-06-07 02:12:26 -0700 |
---|---|---|
committer | Lucas De Marchi <lucas.demarchi@intel.com> | 2019-06-17 12:32:30 -0700 |
commit | 32fd773384afc2b9e8dfc9c8ee1927f34b852fab (patch) | |
tree | f3e52e5a331ea8605c477519848ab26f356cf55b /drivers/gpu/drm/i915 | |
parent | 46fcbe4b5e40d5f0862b44cd1c7d9adbbe59f511 (diff) | |
download | linux-32fd773384afc2b9e8dfc9c8ee1927f34b852fab.tar.bz2 |
drm/i915/dmc: extract function to parse package_header
Like parse_csr_fw_css() this parses the package_header from firmware and
saves the relevant fields in the csr struct. In this function we also
lookup the fw_info we are interested in.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190607091230.1489-6-lucas.demarchi@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915')
-rw-r--r-- | drivers/gpu/drm/i915/intel_csr.c | 117 |
1 files changed, 66 insertions, 51 deletions
diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c index 3cf2f2bc6b5c..a0188f87904f 100644 --- a/drivers/gpu/drm/i915/intel_csr.c +++ b/drivers/gpu/drm/i915/intel_csr.c @@ -332,6 +332,64 @@ static u32 find_dmc_fw_offset(const struct intel_fw_info *fw_info, return dmc_offset; } +static u32 +parse_csr_fw_package(struct intel_csr *csr, + const struct intel_package_header *package_header, + const struct stepping_info *si, + size_t rem_size) +{ + u32 package_size = sizeof(struct intel_package_header); + u32 num_entries, max_entries, dmc_offset; + const struct intel_fw_info *fw_info; + + if (rem_size < package_size) + goto error_truncated; + + if (package_header->header_ver == 1) { + max_entries = PACKAGE_MAX_FW_INFO_ENTRIES; + } else if (package_header->header_ver == 2) { + max_entries = PACKAGE_V2_MAX_FW_INFO_ENTRIES; + } else { + DRM_ERROR("DMC firmware has unknown header version %u\n", + package_header->header_ver); + return 0; + } + + /* + * We should always have space for max_entries, + * even if not all are used + */ + package_size += max_entries * sizeof(struct intel_fw_info); + if (rem_size < package_size) + goto error_truncated; + + if (package_header->header_len * 4 != package_size) { + DRM_ERROR("DMC firmware has wrong package header length " + "(%u bytes)\n", package_size); + return 0; + } + + num_entries = package_header->num_entries; + if (WARN_ON(package_header->num_entries > max_entries)) + num_entries = max_entries; + + fw_info = (const struct intel_fw_info *) + ((u8 *)package_header + sizeof(*package_header)); + dmc_offset = find_dmc_fw_offset(fw_info, num_entries, si); + if (dmc_offset == CSR_DEFAULT_FW_OFFSET) { + DRM_ERROR("DMC firmware not supported for %c stepping\n", + si->stepping); + return 0; + } + + /* dmc_offset is in dwords */ + return package_size + dmc_offset * 4; + +error_truncated: + DRM_ERROR("Truncated DMC firmware, refusing.\n"); + return 0; +} + /* Return number of bytes parsed or 0 on error */ static u32 parse_csr_fw_css(struct intel_csr *csr, struct intel_css_header *css_header, @@ -374,7 +432,7 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, struct intel_dmc_header *dmc_header; struct intel_csr *csr = &dev_priv->csr; const struct stepping_info *si = intel_get_stepping_info(dev_priv); - u32 dmc_offset, num_entries, max_entries, readcount = 0, nbytes; + u32 readcount = 0, nbytes; u32 i, r; u32 *dmc_payload; size_t fsize; @@ -389,59 +447,16 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, return NULL; readcount += r; - fsize = readcount + - sizeof(struct intel_package_header) + - sizeof(struct intel_dmc_header); - if (fsize > fw->size) - goto error_truncated; - - /* Extract Package Header information*/ - package_header = (struct intel_package_header *) - &fw->data[readcount]; - - readcount += sizeof(struct intel_package_header); - - if (package_header->header_ver == 1) { - max_entries = PACKAGE_MAX_FW_INFO_ENTRIES; - } else if (package_header->header_ver == 2) { - max_entries = PACKAGE_V2_MAX_FW_INFO_ENTRIES; - } else { - DRM_ERROR("DMC firmware has unknown header version %u\n", - package_header->header_ver); - return NULL; - } - - if (package_header->header_len * 4 != - sizeof(struct intel_package_header) + - max_entries * sizeof(struct intel_fw_info)) { - DRM_ERROR("DMC firmware has wrong package header length " - "(%u bytes)\n", package_header->header_len * 4); - return NULL; - } - - num_entries = package_header->num_entries; - if (WARN_ON(package_header->num_entries > max_entries)) - num_entries = max_entries; - - fsize += max_entries * sizeof(struct intel_fw_info); - if (fsize > fw->size) - goto error_truncated; - dmc_offset = find_dmc_fw_offset((struct intel_fw_info *) - &fw->data[readcount], num_entries, si); - if (dmc_offset == CSR_DEFAULT_FW_OFFSET) { - DRM_ERROR("DMC firmware not supported for %c stepping\n", - si->stepping); + /* Extract Package Header information */ + package_header = (struct intel_package_header *)&fw->data[readcount]; + r = parse_csr_fw_package(csr, package_header, si, fw->size - readcount); + if (!r) return NULL; - } - /* we always have space for max_entries, even if not all are used */ - readcount += max_entries * sizeof(struct intel_fw_info); - - /* Convert dmc_offset into number of bytes. By default it is in dwords*/ - dmc_offset *= 4; - readcount += dmc_offset; - fsize += dmc_offset; + readcount += r; + fsize = readcount + + sizeof(struct intel_dmc_header); if (fsize > fw->size) goto error_truncated; |